pngchunks(1)

NAME

   pngchunks - print information embedded into a PNG file

SYNOPSIS

   pngchunks file

DESCRIPTION

   pngchunks  is  a  program that displays informations from files created
   according to the Portable Network Graphics file format.

EXAMPLE

   pngchunks input.png  Chunk:  Data  Length  13  (max  2147483647),  Type
   1380206665 [IHDR]
     Critical, public, PNG 1.2 compliant, unsafe to copy
     IHDR Width: 256
     IHDR Height: 256
     IHDR Bitdepth: 8
     IHDR Colortype: 2
     IHDR Compression: 0
     IHDR Filter: 0
     IHDR Interlace: 0
     IHDR Compression algorithm is Deflate
     IHDR Filter method is type zero (None, Sub, Up, Average, Paeth)
     IHDR Interlacing is disabled
     Chunk  CRC:  -753909967  Chunk:  Data Length 6 (max 2147483647), Type
   1145523042 [bKGD]
     Ancillary, public, PNG 1.2 compliant, unsafe to copy
     ... Unknown chunk type
     Chunk CRC: 554438993 Chunk: Data  Length  9  (max  2147483647),  Type
   1935231088 [pHYs]
     Ancillary, public, PNG 1.2 compliant, safe to copy
     ... Unknown chunk type
     Chunk  CRC:  -757235972  Chunk:  Data Length 7 (max 2147483647), Type
   1162692980 [tIME]
     Ancillary, public, PNG 1.2 compliant, unsafe to copy
     ... Unknown chunk type
     Chunk CRC: 429243611 Chunk: Data Length 831  (max  2147483647),  Type
   1413563465 [IDAT]
     Critical, public, PNG 1.2 compliant, unsafe to copy
     IDAT contains image data
     Chunk  CRC:  1406256926  Chunk:  Data Length 0 (max 2147483647), Type
   1145980233 [IEND]
     Critical, public, PNG 1.2 compliant, unsafe to copy
     IEND contains no data
     Chunk CRC: -1371381630

SEE ALSO

   pngchunkdesc(1), pngcp(1), pnginfo(1).

AUTHOR

   pngchunks was written by Michael Still <[email protected]>.

   This   manual   page   was   written   by   Nelson   A.   de   Oliveira
   <[email protected]>,  for  the  Debian  project  (but  may  be  used by
   others).

                    Tue, 31 Jul 2007 17:55:51 -0300           PNGCHUNKS(1)

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